Apparatus for casting pipes.



r J. HORNER.

APPARATUS FOR CASTING PIPES.

APPLICATION FILED .IUNEZB. I915.

1,1 88,938. Patnted June 27, 1916.

WNTTED STATE PATENT @FFTQE.

JOHN I-IORNER, 0F BRISTOL, PENNSYLVANIA, ASSIGNOR TO STANDARD CAST IRON PIPE & FOUNDRY COMPANY, OF BRISTOL, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

APPARATUS FOR CASTING PIPES.

Application filed June 28, 1915.

To all whom it may concern: 7

Be it known that I, JOHN HORNER, a citizen of the United States, residing at Bristol, in the county of Bucks and State of Penn sylvania, have invented certain Improvements in Apparatus for Casting Pipes, of which the following is a specification.

In the art ofcast-ing iron pipes, as commonly practised, the, molten metal flows from a gate through comparatively large runners in a bead core disposed at the top of the mold around the main core, with the result that the beads particularly, as well as other parts of the pipes, are rendered defective frequently by dross flowing through the runners with the iron and entering into the structure of the pipes. The large streams of molten metal flowing through the runners, which are few in number to limit the rate of flow, are separated by comparatively large arcs and fall with considerable force, particularly in casting long pipe, with consequent splashing and agitation of the metal and the occlusion of more or less air and gas, whereby the structure of pipes is rendered irregular and defective in many instances. Substantial percentages of pipes are condemned because of defects resulting from these causes, such defects necessitating scrapping the whole or a part, and many requiring the removal of their head ends and the provision of beads on the ends of the remaining sections by cutting channels therein and shrinking rings in the channel to provide beads.

It is the primary object of my invention to eliminate the dross, reduce the agitation of the metal and avoid the occlusion of gas in the operation of casting the metal, by the use of an operation which divides such metal into many closely placed fine streams from which the dross is strained, and efl'ecting the junction or substantial junction of such streams to form a continuous or substantially continuous body in the form of a comparatively thin sheet corresponding approximately to the contour of the pipe, the metal thus distributed being deposited without the usual agitation or occlusion of air or gas and the losses are reduced to a minimum.

The characteristic features of my invention are disclosed in the following description and the accompanying drawings in illustration thereof.

Specification of Letters Patent.

Patented June 27, 1916.

Serial No. 36,637.

In the drawings, Figure 1 is a top plan vlew of a pipe core surrounded by a gate through which metal is poured in casting; Fig. 2 is a broken part sectional elevation of mechanism used in the practice of my invention, including the construction shown in Fig. 1; Fig. 8 is a plan view of the bead core detached from Fig. 2; Fig. 4: is a sectional view of the construction shown in Fig. '3; Fig. 5 is a top plan view of a pipe core surrounded by the usual gate; and Fig. 6 is a broken part sectional elevation representing the usual construction and operation in casting pipe through the gate shown in Fig. 5.

The drawings illustrate the usual vertical mold 1 containing the main core 2 between which is the form 3 for the pipe 4:. The main core is surrounded by a bead core 5 and a gate 6 at the top of the mold, the core and gate having the runners 7 through which the metal flows and the vent 8 for the escape of the gas. These runners are comparatively large, few in number and widely separated because it is necessary to limit the rate at which the metal is poured. The comparatively large streams of metal 9, widely separated by spaces 10, fall at separated places with considerable force, particularly in casting the lower parts of long pipes, wherefore the metal is splashed and agitated and occludes more or less gas as well as air, while impure matter readily passes through the runners and is incorporated in the structure of the pipe, particularly in the bead formed at the top thereof, as illustrated more particularly in Figs. 5 and 6.

As illustrated in Figs; 1 to 4 inclusive, in practising my invention,I use a gate 11 and a bead core 12 with numerous small runners 13, of such reduced size and increased number as to prevent the passage of dross through the runners with the metal, and the fine streams of metal are so comparatively close together that by their expansion below the runners they effect conjunction or substantial conjunction of the metal in a continuous or substantially continuous thin sheet surrounding the main core within the mold. The metal thus purified and distributed falls without the usual agitation or occlusion of air or gas, and with the production of a structure of improved character, greatly reducing the waste as well as wholly or in great measureavoiding the necessity for cutting and repairing pipe ends due to defective beads.

Having described my invention, I claim:

1. In apparatus for casting iron or steel pipes, the combination of a mold, with means comprising runners of such limited cross sectional area and comparative close relation that they will separate dross from the metal and pass metal in finely divided streams related so as to join or substantially join in falling within the mold.

2. In apparatus for casting iron or steel pipes, the combination with a main core, a mold having a bead core at the top thereof surrounding said main core, said bead core having runners of reduced cross sectional area, and a gate, whereby metal poured through said gate flows through said runners into said mold and dross contained in said metal is excluded from said mold.

3. In apparatus for casting iron or steel pipes, the combination with a main core, a mold surrounding said core, a bead core surrounding said main core at the top of said mold, and a gate above said bead core, said bead core and gate having runners of reduced cross sectional area whereby metal poured through said gate and bead core has dross strained therefrom.

In Witness whereof I have hereunto set my name this 25th day of June, 1915, in the presence of'a subscribing witness.

JOHN I-IORNER. IVitness J 05. G. DENNY, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.? 

